Talking-machine horn



J. WOLFF. TALKING MACHINE HORN. APPLICATION FILED APR.28. 1915. RENEWED JAN. 3. 1921.

Patented Aug. 9, 1921.

Inventor J/l u Attorney.

Wlt e 3% J g" y fimym.

UNITED STATES PATENT OFFICE."

JOSEPH WOLFE, OF BROOKLYN, NEW YORK, ASSIGNOR TO SONORA PHONOGRAPH CORPORATION, A CORPORATION OF NEW YORK.

TALKING-MACHINE HORN.

Specification of Letters Patent.

Patented Aug. 9, 1921.

Application filed April as, 1915, Serial No. 24,450. Renewed January 3, 1921. Serial No. 434,782.

- To all whom it may concern Beit known that I, JOSEPH WOLFE, a sub ject of the King of Great Britain and Ireland, and residing at Brookl n, in the county of Kings, city and State of ew York, have invented a certain new and useful Talking- Machine Horn, of which the following is a specification. Y

I have discovered that with the ordinary wood horns for talking machines, the sound wavespenetrate the wood to a considerable degree and their force and color are more or less. lost, and that because of such absorption, relatively thin tones are produced with the consequent tendency to rattle on high notes and produce audible needle scratch.

When producing great volume the scratch increases with the volume, and part of the tone is absorbed by the wood, and the scratch is apparently magnified. I

I have found that by increasing the number of laminations of a veneer horn above three, the number commonly employed, to a greater number, with the grain of each adjoining layer running in o posite directions,

the tone is all projected t rough the mouth of the horn, thus producing a greater.volume of tone with more force and warmth, but with less audible needle scratch than is possible with horns of three laminations, for the reason that the scratch is not magnified by any increased horn area but remains relatively the same, and the greater volume and force of tone which is projected from the mouth of the horn drowns orsmothers it and this proportion of scratch to volume is always the same, even with varied volumes produced by the use of different toned needles. j c I I likewise havediscovered that by coating the outside of my improved horn with a material, such as silicateof soda,'such sound waves as penetrate the materialof the horn are reflected back. i y

' I have also found that with a horn, of double construction, the inner wall of which i will absorb some of the sound, and an outer 'neerin wall, which will be impervious to sound, a

' produced, and blasting and rattling vibrations are entirely eliminated on high notes.

These and further objects will more fully appear in the following specification and accompanying drawings considered together or separately.

My invention is illustrated in the drawings, and described in the specification, in which corresponding parts in all the figures are designated by similar reference characters.

In the drawings, Figure l is a cross section of a talking machine'cabinet showing a horn in position;

Fig. 2 is a sectional View, on an enlarged scale, through a corner of the outer wall of a horn;

Fig. 3 is a perspective View of a portion of the outer wall of a'horn; Y

Fig. 4: is a detail edge view,*on a very much enlarged scale, of a portion of the oufler Wall of a horn showing a modification; an

t Fig. 5 is a detail sectional view of a horn showing another modification.

In all of the above views similar reference characters designate corresponding parts in all ofthe figures.

In the drawings, 1 designates'a talking machine cabinet. of any well known form. WVithin the cabinet is locateda horn or diffuser 2. The horn shown is of the type known as the hornless, that is, one in which the horn is built in the cabinet and concealed from View. The horn is of generally rectangular cross section, and is built up of wall pieces 3, each composed of ve- In t e embodiment shown in Figs. 1, 2, and 3 the walls aare built up of; five laminae layers 4, 5, 6, 7 and 8. The layers are arranged in such a manner that the grain of each layer will run in a different direction from that of the next adjoining layer, and the layers are firmly secured together, as by gluing. The wall just described is composed of a wood veneer, but it will be understood that other substances may be em ployed.

In Fig. 4 is shown a veneer of eleven layers, the outer layers being of wood. the each alternate one of fiber or rubber or other suitable material.

In Fig. 5 I have shown the horn 2 as built up of two sections, an inner section 9 of solid construction and built of wood or other suitable material, and an outer section 10 of laminated wood, fiber, rubber or other material or combination of materials as shown in Figs. 2, 3 and 4.

The inner section 9 is of a size to closely fit the interior of the outer section, but is not secured thereto, thus leaving a thin air space 11 between the sections. The outer edges of both sections at the front and rear of the horn are covered by a binding 12, and the wholeexterior of the device is covered with a coating 13 of silicate of soda, which is applied in several coats, each being rubbed down before the succeeding coat is applied. If desired the entire horn inside and outside may receive the silicate of soda coating.

I desire it to be understood that I do not wish to limit myself to any particular material used in the construction of my improved device, nor do I desire to limit myself to the exact number of layers to be employed above three. The walls may be made of any ultimate thickness and veneer of any degree of thinness may be employed.

In operation, the sound waves set up by the vibrations of the diaphragm of the speaker, will traverse the horn from the back or small end to the flaring front and be projected into the atmosphere. Practically all of the sound will reach the outlet for the reason that the inner thin layer will be the only one which will absorb any considerable amount of sound which will nearly all be reflected by the next layer. The small amount of sound absorbed by the second layer will be turned back by the third, and so on to the outside. The more layers in the walls, up to the point where the walls become so thick and heavy as to be unresponsive to the sound vibrations, the better will be the result.

In accordance with the provisions of the patent statutes, I have described the principles of myinvention, together withthe apparatus which I now consider to represent the best embodiment thereof, but I desire to have it understood that the invention'described in the drawings is merely illustrative, and that the invention may be carried out in other ways without departing from the spirit oi my invention.

Having now described my invention, what I claim as new and desire to secure by Letters Patent oi the United States, is:

1. A talking machine horn, having a wall of a single thickness of material, and an in dependent wall of laminated material.

2. A talking machine horn having a wall of a single thickness of material, and a wall of laminated material, there being an air space between the walls.

A talking machine horn, having a wall composed of a single thickness of a fibrous material, a wall composed of a plurality of laminae ot' fibrous material, there being an air space between the walls, and a member encircling the extremity of the horn and in- (losing the air space.

at. A talking machine horn, having an inner wall of a single thickness of fibrous material, and an outer wall composed of a plurality of laminae of fibrous material, there being an air space between the walls.

A talking machine horn, having an inner wall of a single thickness of fibrous material, and an outer wall composed of aplurality of laminae of, fibrous material, there being an air space between the walls, and a member encircling the extremity of the horn and inclosing the air space.

6. A talking machine horn, having an inner wall of a single thickness of fibrous material, and an outer wall composed of a plurality of laminae of fibrous material, there being an air space between the walls, there being an air-tight covering on the exterior of the outer wall of the horn.

T. A talking machine horn, having an inner wall of a single thickness of. fibrous material, and an outer wall composed oi a plurality of laminae oi fibrous material, there being an air space between the walls, and a member encircling the extremity of the horn and inelosing the air space, there being an air-tight covering on the exterior of the laminated all. 7

8. A talking machine horn, having an inner wall of a single thickness 01 fibrous material, and an outer wall composed of a plurality of laminae of fibrous material, there being an air space between the walls, and an air-tight member encircling the extremity of the-horn and inclosing the air space. 1 9. A talking machine horn, having an inner wooden wall of a single thickness, and an outer wall composed of a plurality of laminated wood, there being an air spacebetween the walls.

10. A talking machine horn, having an inner wooden wall of a single thickness, an outer wall composed of a plurality of laminated Wood, there being an air space between the walls, and a member encircling the extremity of the horn and inclosing the air space.

11. A talking machine horn, having an inner wooden wall of a single thickness, and an independent outer wall composed of a plurality of laminated wood. I

12. A talking machine horn, having a wall composed of a single thickness of fibrous material, and an independent wall composed of a plurality of laminae of fibrous material.

13. A talking machine horn, having a wall of a single thickness of fibrous material, and a wall composed of a plurality of laminae of fibrous material, there being an air space between the walls.

This specification signed and witnessed this 23rd day of April, 1915.

JOSEPH WOLFF.

WVitnesses MARTIN A. KERNER, HUBERT W. WEISE. 

